var Speedi = 0
var Speedres = document.getElementsByClassName('lyz_i')
var Speeddiv = document.getElementsByClassName('lyz_li_div')
//	上一步
function upper() {
	if (Speedi == 0) {
		return
	} else {
		Speeddiv[Speedi].classList.remove("lyz_li_show")
		Speedi--
		Speedres[Speedi].style = "width:0%"
	}
}
// 下一步
function lower() {
	if (Speedi == Speedres.length) {
		return
	} else {
		Speedres[Speedi].style = "width:100%"
		Speedi++
		setInterval(function() {
			Speeddiv[Speedi].classList.add("lyz_li_show")
		}, 800)
	}
}
